You need to see a neurologist.
One would not jump to an MRI of the brain. Too much thyroid medicine, diabetes, low magnesium, B vitamin deficiency, other electrolyte imblance, muscle strain and stress, benign fasiculations.....and more All of these need to be ruled out.
MRI would only be based on neuro exam findings.
Parkinsons typically does not start like this.
Certainly, rare causes, such as MD and ALS can easily be ruled out by the correct specialist.
I am a double board certified doctor.
Let me know if you have more questions.
Please do not forget a positive rating.